Dmitry Andreev
@and_coder
started inciprocal, ex-lucasarts, ex-electronic arts, ex-demoscener "and"; engineer / inventor / entrepreneur
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Some close-ups. Can drive a number of off the shelf HW for a more time efficient sequencing. In the most universal configuration like what's shown here, it can be driven by any turntable or other triggering equipment in a "slave" mode wirelessly or via standard trigger cable.
High-res close-ups of a 12-light rig. Mounted on GODOX 240FS Light Stand and driven by Syrp Genie Mini 2 turntable. One of the most basic configurations that's easy to move around and actuate. Important to has as little turntable footprint at possible to minimize light occlusion.
I think I found the case where Chinese factory is not a viable solution. Wanted to get these custom Polyacetal gears manufactured but anything reasonable that is injection molding based starts at 1000 QTY and not good for small batches. But my first CNC tests look promising.
Another rig complete. The guys are still going to put nice laser cut frame and covers around it. This also went through joint hardware/software optimization process in here nearly every shot make a difference and used for reconstruction.
2K Games the Minotaur Rig prototype complete and calibrated. This is our most minimalistic and optimized PBR face scanning rig configuration so far. Running 20 Sony A9 III cameras at 60 fps and 16 composite light clusters using IDA Tronic lights.
Damn Google with their new Android 16k page alignment requirement... Spent 3 days and a lot of chatgpt-ing to get all Qt and other native libraries reconfigured and recompiled. So of the configs and libs were 10-15 years. All worked great though - don't touch if it works!
Got some CAD parts of a custom Tilta CPL micro-motor worked out and 3D printed to test the fitting. It's almost injection molding friendly but some modification will be needed for sure. Especially the addition of draft angles.
Still find it using regular 3D art tools like Blender much easier for initial design and proxy fitting. This will be re-modelled with proper CAD software to get all the STEP files for manufacturing. But I got the functional prototype working with off-the-shelf breakout parts.
Sometimes it takes a lot of trial and error to get something right. This was me getting the right gear prototype 3D printed. 24 tries on the left just to get printer settings right. Another 8 to get the slicer do the right things. So 32 tries just to get a single gear.
First pass prototype complete. Got all the gears worked out as well as the PID control optimized specifically for quick 90 degree rotations as fast and as smooth as possible. It now takes Tilta CPL 1/4 of a second to switch with minimal noise. Shrink electronics down next...
A little setup for Hall tuning and calibration. Got full quadrature decoding for extra precision. It now has 3794 ticks per 360 degrees of the whole filter. 1/10 of a degree precision. More than enough for accurate CPL positioning.
A little python script I did a while back to capture the screen, run OCR on that to get the values from a RAW tool and then average the result. One trick is that you can't average K (Kelvin) temperature as it's non-linear but it's inverse is. So average 1/K and inverse the sum.
Calibrating White Balance for multi-cam / multi-light Light Stage-like rigs can be quite tedious. Apart from cameras, there is alight light color variation as well as natural Poisson noise in RAW images that can greatly tint the result requiring a number of samples to converge.
To all RAW image processing devs: When implementing custom White Balance pickers do allow much larger sampling windows, hundreds or even thousands of pixels. All images have noise that messes it up and you have to average over much larger areas. 32 pixels is nothing @RawTherapee
Taking a little step back from steppers and looking into closed-loop servos. This little micro-DC motor has significantly more torque than the best micro stepper out there and I tested a bunch. Going brushless would be the next step though I need to test it to destruction.
While buying a lot of LED stuff from a factory that supposed to be a single manufacturing batch there are still quite a few spectral discrepancies here and there. Most likely messed up at the packing stage or something. You can see a few that clearly have different temperature.
The rolling shutter artifacts (stripes) are due to all-lights-on-preview mode that has 100Hz-ish PWM. The actual per-lights shots are artifact free.
A wide angle view... While the standard 12-light rig is very versatile, the 24-light 180 degree Arc is ideal when scanning through a props of similar sizes and topologies. Once tuned, it's a beast. skfb.ly/oFRxT
These consumer cameras like Sony Alpha 1 can be pushed all the way to 20 fps, but being rolling shutters drops the exposure to 1/60th that's not ideal. Higher speed global shutter ones like Sony a9 III can run much faster but they are only 24 MP that's not that great for props.
PBR Capture of Adidas IF6704 with 180 degree 24-Light Arc. 5 Cameras, 24 lights, 2 polarization states (48 shots per position). Sony Alpha 1 electronic 1/30 shutter at 15 fps burst synchronized. The shutter sound is digital, just for exposure indication. skfb.ly/p7Hsu
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